DALLAS -- An art collection worth an estimated $150 million that belonged to the late Texas oil and ranching heiress Anne Marion is going up for auction this spring in New York.Sotheby's said Wednesday that Marion's private collection includes works by Andy Warhol, Roy Lichtenstein and Franz Kline.Marion, who founded the Georgia O'Keeffe Museum in Santa Fe, New Mexico, died last year at the age of 81.